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<p><strong>Recomenda&ccedil;&atilde;o 2.7 - </strong>Sempre que existir uma linguagem de  marca&ccedil;&atilde;o apropriada, utilizar <strong>&nbsp;</strong>marca&ccedil;&otilde;es em vez de imagens para transmitir informa&ccedil;&otilde;es, um  exemplo &eacute; a linguagem&nbsp; MathML que permite  a cria&ccedil;&atilde;o de f&oacute;rmulas matem&aacute;ticas somente utilizando-se das <em>tags</em>&nbsp;  apropriadas. <br />
Exemplo: No caso de equa&ccedil;&otilde;es matem&aacute;ticas use MathML  para sua constru&ccedil;&atilde;o e folhas de&nbsp; estilo  para formatar o texto e controlar o <em>layout</em>. Evite tamb&eacute;m usar imagens para  representar&nbsp; texto. </p>
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    <li class="alt">&lt;semantics&gt;&nbsp; &lt;mrow&gt; </li>
    <li class="">&lt;mo&gt;?&lt;/mo&gt; </li>
    <li class="alt">&lt;mn&gt;0&lt;/mn&gt;&nbsp; </li>
    <li class="">&lt;mi&gt;t&lt;/mi&gt; &nbsp;</li>
    <li class="alt">&lt;/msubsup&gt;&nbsp; </li>
    <li class="">&lt;mfrac&gt; &lt;mrow&gt;&nbsp; </li>
    <li class="alt">&lt;mo&gt;d&lt;/mo&gt;</li>
	<li class="">&lt;mi&gt;x&lt;/mi&gt;&lt;/mrow&gt;&nbsp; </li>
    <li class="alt">&lt;mi&gt;x&lt;/mi&gt;</li>
	<li class="">&lt;/mfrac&gt;&lt;/mrow&gt;</li>
    <li class="alt">&lt;annotation-xml  encoding=&rdquo;MathML-Content&rdquo;&gt;</li>
	<li class="">&lt;apply&gt;&lt;int/&gt;&nbsp; </li>
    <li class="alt">&lt;bvar&gt;&lt;ci&gt;x&lt;/ci&gt;&lt;/bvar&gt;</li>
	<li class="">&lt;lowlimit&gt;&lt;cn&gt;0&lt;/cn&gt;&lt;/lowlimit&gt;&nbsp; </li>
    <li class="alt">&lt;uplimit&gt;&lt;ci&gt;t&lt;/ci&gt;&lt;/uplimit&gt;</li>
	<li class="">&lt;apply&gt;&lt;divide/&gt;</li>
    <li class="alt">&lt;cn&gt;1&lt;/cn&gt;</li>
	<li class="">&lt;ci&gt;x&lt;/ci&gt;&nbsp; </li>
    <li class="alt">&lt;/apply&gt;&lt;/apply&gt;&nbsp; </li>
	<li class="">&lt;/annotation-xml&gt; </li>
    <li class="alt">&lt;/semantics&gt;</li>
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